Robotic arm



FIG. 1 is a back view of the lower joint of a robotic arm showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a perspective view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a perspective view thereof in context;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The portions of the robotic arm, shown overexposed in FIG. 6 is for the purpose of illustrating environment that forms no part of the claimed design. 

CLAIM The ornamental design for a robotic arm, as shown and described. 